Pump



FIG. 1 is a perspective view of a pump, showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a side elevational view (left) thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a side elevational view (right) thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front view thereof. 

The ornamental design for a pump, as shown and described. 